merc 110 9.8 prop potential 2 blade vs. 3 blade

vern2b

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Joined
May 3, 2002
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2
I have a merc 9.8 on a 12'v hull . I have a 2 blade prop and want to know if a 3 blade prop would give me more speed (top end) :confused:
 

steelespike

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Apr 26, 2002
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19,069
Re: merc 110 9.8 prop potential 2 blade vs. 3 blade

Vern, Generally speaking the number of blades doesnt determine speed. To keep it simple the pitch of the prop determines speed. Dont know reccomendations for your motor.But youll need to know what prop you have to start with. There may be numbers on prop like 8X8 or 10X10 I believe thats diameterX pitch. Generally speaking,lower pitch(lower number)gives more power but less top speed. More pitch (higher number) Gives higher top speed less power.Kind of like low gear compared to high gear on a car.With your little boat and motor weight distribution is important<br /> Too much in the stern it will be slow to plane or not plane at all.Too much in the bow and it will tend to plow and be difficult to control.<br /> Dont carry any more weight than you need for a<br />safe trip. Believe it or not you may get better load performance with a 14 than your twelve <br />because the 14 can get up on the water easier with a load. Keep in mind the 14 cant be all junked up steering and floors and a lot of uneccesary weight. Hope this is some help.<br /> Spike
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: merc 110 9.8 prop potential 2 blade vs. 3 blade

Vern, To further complicate what I said. If you carry a couple of guys and gear most of the time<br />you may need less pitch for better top end.<br /> But when you are alone you need to be aware that it may be possible to over rev your motor.And your top speed may be less than a higher pitch because the RPM limit wont let it reach top speed??? See what I mean?
 

vern2b

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May 3, 2002
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Re: merc 110 9.8 prop potential 2 blade vs. 3 blade

thanks spike . I've noticed that when I am alone and transfer my tank to the front it runs faster . and when I move to the middle seat it goes even faster.It just seems like I cant get enough rpm's out of the motor . I also added a whale tail and planed out better ,especially with 2 people.
 

one more cast

Captain
Joined
May 6, 2002
Messages
3,143
Re: merc 110 9.8 prop potential 2 blade vs. 3 blade

this might be a little late :D but....<br /> My cousin has a '70's 9.8 with a 2 blade 10p prop and he could get no rpm's at WOT so he just bought a 3 blade 7p prop off eBay and what an improvement it made on top end, it also will run slower at low speed for improved trolling.
 
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